1. Polymer Chemistry Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), P.O Box 29, Cairo, Egypt
2. Botany and Microbiology Department, Faculty of Science (Boys), Al-Azhar University, Cairo, Egypt
3. Drug Microbiology Lab., Drug Radiation Research Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), P.O Box 29, Cairo, Egypt